Grain size and grain boundary character distribution in ultra-fine grained (ECAP) nickel

Raju, K. C. James; Krishna, M. Ghanashyam; Padmanabhan, K. A.; Muraleedharan, K.; Gurao, N.P.; Wilde, Gerhard

doi:10.1016/j.msea.2007.11.072

Cited by 56 publications

(28 citation statements)

References 12 publications

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“…At such large strains the fraction of HABs in HPT-deformed Ni was about 70% and the boundary spacing saturated at ~50 nm as measured using TEM [28]. HAB fractions of about 70% were also reported in Ni processed by equal channel angular pressing after a strain of ~12 [29,30], however these values were based on the EBSD data where misorientations less than 2° were not taken into account.…”

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confidence: 93%

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

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A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB). Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels. Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ0 = k2dav-0.5, where k2 is a constant and dav is the average boundary spacing in the deformed microstructure. Abstract: A detailed investigation of the microstructure and mechanical properties has been conducted in pure nickel deformed to high strains using accumulative roll bonding (ARB).Samples have been investigated after different numbers of ARB cycles and the results have been compared with data for nickel processed by other deformation techniques, with particular focus on conventional rolling. It is found that the structural evolution in ARB-processed nickel is rapid at low strains followed by a slower evolution as the strain approaches ultrahigh levels.Comparing samples processed by ARB and conventional rolling to an identical nominal strain, the microstructure after ARB is more refined and contains a greater fraction of high angle boundaries. This enhanced refinement is attributed to the geometric accumulation of shear-strain influenced volumes as a result of the ARB process and large-draught rolling conditions. Based on *Manuscript Click here to view linked References 2 the observations, it is suggested that the key strengthening mechanisms in deformed nickel are grain boundary and dislocation boundary strengthening, and that the strength-microstructure relationship can be expressed by a single parameter equation, σ-σ 0 = k 2 d av -0.5 , where k 2 is a constant and d av is the average boundary spacing in the deformed microstructure.

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confidence: 93%

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Zhang

Mishin

Kamikawa

et al. 2013

Materials Science and Engineering: A

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“…Ultra-fine grained materials, which are widely applied in many fields for their higher mechanical performance, have an average grain size smaller than 1 m. In the last decade, some different severe plastic deformation (SPD) techniques were developed extensively for the effective production of these metallic materials [1]. As one of the SPD methods, the equal channel angular extrusion (ECAE) technique was first introduced by Segal and his colleagues in 1970s and 1980s [2,3].…”

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Microstructures evolution and phase transformation behaviors of Ni-rich TiNi shape memory alloys after equal channel angular extrusion

Zhang

Song

Huang

et al. 2011

Journal of Alloys and Compounds

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“…Equal channel angular pressing (ECAP), aimed at the fabrication of massive bulk nanostructured materials (NSM) or UFG materials, has been successfully used to obtain UFG and even NSM microstructures from Al, Cu, Ni, Ti, steel, Mg and their alloys [3][4][5][6][7][8]. The deformation behavior and grain refinement mechanism of relatively soft alloys with FCC structures, e.g.…”

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Microstructure evolution of commercial pure titanium during equal channel angular pressing

Chen

Walmsley

et al. 2010

Materials Science and Engineering: A

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Grain size and grain boundary character distribution in ultra-fine grained (ECAP) nickel

Cited by 56 publications

References 12 publications

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Microstructure and mechanical properties of nickel processed by accumulative roll bonding

Microstructures evolution and phase transformation behaviors of Ni-rich TiNi shape memory alloys after equal channel angular extrusion

Microstructure evolution of commercial pure titanium during equal channel angular pressing

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